Edit: I'm raising this to a 5 star rating for customer service. I was offered a set of tools that would fit the connectors. I based the quality on the odd size, but apparently they sell two different sizes of MC4 connectors. They will suit my needs but if I wanted something for a more permanent installation I would look elsewhere. Bought Renogy MC4 tools and they don't fit, end caps are smaller than wrenches. I ended up using channel locks to tighten them up.
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